Reference for Chullin 199:5
כל שדרכו לימנות שנינו אלא למ"ד
but according to him who says that the expression '[only] that which one is wont to count'<span class="x" onmousemove="('comment',' Whatsoever is more comprehensive than that. According to the former teaching neutralization is not permitted in the case of objects which are regarded as of sufficiently high commercial value to be sold in units rather than in bulk. According to the latter teaching neutralization is permitted in all cases except those where the objects are of such high value as not to be sold save by counting single units. Those things, however, which are sold by weight as well as by number would be neutralized in the larger mixture, v. Yeb. (Sonc. ed.) p. 551, n. 11. The question therefore remains, why is not the piece of nebelah neutralized in the larger mixture?');"><sup>4</sup></span>